# Form 4/B/L **URL:** https://forum.formlabs.com/c/support-troubleshooting/form-4-4b/75.md [Latest](https://forum.formlabs.com/latest.md) · [Categories](https://forum.formlabs.com/categories.md) · [Tags](https://forum.formlabs.com/tags.md) --- ## [About the Form 4/B/L category](https://forum.formlabs.com/t/about-the-form-4-b-l-category/38694)
**Author:** [@DKirch](https://forum.formlabs.com/u/DKirch)\ **Replies:** 0
--- ## [Enabling Custom Squish](https://forum.formlabs.com/t/enabling-custom-squish/43729)
**Author:** [@CCWP](https://forum.formlabs.com/u/CCWP)\ **Replies:** 14\ **Last updated:** [October 8, 2026, 4:03pm UTC](https://forum.formlabs.com/t/enabling-custom-squish/43729 "2026-10-08T16:03:00Z")
We’ve been having some dimensional issues with our Form4B (material: BioMed Clear V1) at work and one of the settings that I want to change is the ‘Squish Wait’. But when ever I enable Custom Squish, without changing any… --- ## [Why does pausing a print for 60 seconds auto abort?](https://forum.formlabs.com/t/why-does-pausing-a-print-for-60-seconds-auto-abort/46907)
**Author:** [@kfhawki](https://forum.formlabs.com/u/kfhawki)\ **Replies:** 4\ **Last updated:** [October 6, 2026, 5:00pm UTC](https://forum.formlabs.com/t/why-does-pausing-a-print-for-60-seconds-auto-abort/46907 "2026-10-06T17:00:26Z")
When you pause a print and open the door, why does it mention your failure rate is more likely?What is making it more likely to fail? Is there a way to bypass this warning? --- ## [Form4 Elastic 50A discoloured in tank](https://forum.formlabs.com/t/form4-elastic-50a-discoloured-in-tank/46115)
**Author:** [@MurphKieran](https://forum.formlabs.com/u/MurphKieran)\ **Replies:** 5\ **Last updated:** [September 28, 2026, 2:59pm UTC](https://forum.formlabs.com/t/form4-elastic-50a-discoloured-in-tank/46115 "2026-09-28T14:59:50Z")
I loaded a bottle of Elastic 50A into my Form 4 less than seven days ago into a brand new tank with mixer. I printed several models with great success and got my desired white/clear post-processing results. I sent anothe… --- ## [Tiny holes (bubbles?) at surface of prints](https://forum.formlabs.com/t/tiny-holes-bubbles-at-surface-of-prints/46487)
**Author:** [@DKodiak](https://forum.formlabs.com/u/DKodiak)\ **Replies:** 9\ **Last updated:** [September 15, 2026, 8:16pm UTC](https://forum.formlabs.com/t/tiny-holes-bubbles-at-surface-of-prints/46487 "2026-09-15T20:16:59Z")
Hello Formlabs community, I seem to have an issue with my prints, especially with White V5 resin. At first, the parts look good but as soon as I start to sand them at the surface layers to clear the print lines, tiny ho… --- ## [Small miniature failures - Post Expose Cure Wait / Squish Intensity made a huge difference](https://forum.formlabs.com/t/small-miniature-failures-post-expose-cure-wait-squish-intensity-made-a-huge-difference/46855)
**Author:** [@pkwietniak](https://forum.formlabs.com/u/pkwietniak)\ **Replies:** 3\ **Last updated:** [September 11, 2026, 7:22pm UTC](https://forum.formlabs.com/t/small-miniature-failures-post-expose-cure-wait-squish-intensity-made-a-huge-difference/46855 "2026-09-11T19:22:49Z")
I print quite a lot of small miniatures with very thin/delicate parts – arms, hands, swords, etc. – and recently I started getting a lot of failed prints. The typical failure is that one part of the model simply doesn’t… --- ## [Prints not sticking to build platform](https://forum.formlabs.com/t/prints-not-sticking-to-build-platform/46650)
**Author:** [@Lantech50](https://forum.formlabs.com/u/Lantech50)\ **Replies:** 20\ **Last updated:** [September 9, 2026, 12:55pm UTC](https://forum.formlabs.com/t/prints-not-sticking-to-build-platform/46650 "2026-09-09T12:55:48Z")
replaced the LPU and calibrated the z-axis using the little corner discs (done this a few times already). now the first layers of the supports base is not sticking to the buildplate and the prints are failing --- ## [Form 4: Intermittent Exposure Failure Followed by Full Build-Area Resin Curing — Possible LPU Issue?](https://forum.formlabs.com/t/form-4-intermittent-exposure-failure-followed-by-full-build-area-resin-curing-possible-lpu-issue/46820)
**Author:** [@Nihal\_Drotsa](https://forum.formlabs.com/u/Nihal_Drotsa)\ **Replies:** 2\ **Last updated:** [August 31, 2026, 1:19pm UTC](https://forum.formlabs.com/t/form-4-intermittent-exposure-failure-followed-by-full-build-area-resin-curing-possible-lpu-issue/46820 "2026-08-31T13:19:06Z")
We ran into a very strange issue with our Formlabs Form 4 today and are trying to understand what could have caused it. We sent a relatively small print job to the printer with an estimated print time of around 1.5 hour… --- ## [Questions regarding fine-tuning print settings and Squish](https://forum.formlabs.com/t/questions-regarding-fine-tuning-print-settings-and-squish/44077)
**Author:** [@mctech](https://forum.formlabs.com/u/mctech)\ **Replies:** 1\ **Last updated:** [August 20, 2026, 12:59pm UTC](https://forum.formlabs.com/t/questions-regarding-fine-tuning-print-settings-and-squish/44077 "2026-08-20T12:59:55Z")
Our lab is looking into fine tuning our print settings for both speed and accuracy. I’ve been looking into and considering modifying the squish settings as the Formlabs defaults seem to be excessive in some areas. For e… --- ## [Layer shift on magnetic flex build platform](https://forum.formlabs.com/t/layer-shift-on-magnetic-flex-build-platform/46540)
**Author:** [@smerrett](https://forum.formlabs.com/u/smerrett)\ **Replies:** 12\ **Last updated:** [August 16, 2026, 7:21am UTC](https://forum.formlabs.com/t/layer-shift-on-magnetic-flex-build-platform/46540 "2026-08-16T07:21:01Z")
With a full bed and most of the cross section filled on the flex build plate, I’m seeing layer shifts around 1 mm into the print. All I can think of is that the steel sheet isn’t able to hold onto the magnets anymore and… --- ## [Form4 Flex build plate detaching mid print](https://forum.formlabs.com/t/form4-flex-build-plate-detaching-mid-print/46234)
**Author:** [@Vardhamann](https://forum.formlabs.com/u/Vardhamann)\ **Replies:** 5\ **Last updated:** [August 16, 2026, 2:43am UTC](https://forum.formlabs.com/t/form4-flex-build-plate-detaching-mid-print/46234 "2026-08-16T02:43:37Z")
Hi everyone, We recently purchased a new Build Platform Flex for our Form 4 machine and tried using it with Grey Resin V5. During the first print, we had a major failure: the flex plate detached mid-print, which trigger… --- ## [Support settings for car part](https://forum.formlabs.com/t/support-settings-for-car-part/46692)
**Author:** [@eyekey](https://forum.formlabs.com/u/eyekey)\ **Replies:** 15\ **Last updated:** [August 12, 2026, 6:48am UTC](https://forum.formlabs.com/t/support-settings-for-car-part/46692 "2026-08-12T06:48:02Z")
Attached are some pictures of the model i will be printing on the form 4L. Trying to get it to print with minimal clean up if possible to avoid sanding and painting. For the supports in the middle, what are the best se… --- ## [Timelapse](https://forum.formlabs.com/t/timelapse/45381)
**Author:** [@SteamFactoryLLC](https://forum.formlabs.com/u/SteamFactoryLLC)\ **Replies:** 5\ **Last updated:** [August 10, 2026, 9:27pm UTC](https://forum.formlabs.com/t/timelapse/45381 "2026-08-10T21:27:09Z")
What’s up with timelapse lately? Several months ago I created several timelapse videos on the Form 4 and 4L. They were nice and smooth. Now they are jittery and unusable. In fact, when moving into position for the timela… --- ## [Open material mode](https://forum.formlabs.com/t/open-material-mode/43590)
**Author:** [@Kostbone](https://forum.formlabs.com/u/Kostbone)\ **Replies:** 33\ **Last updated:** [August 7, 2026, 2:23pm UTC](https://forum.formlabs.com/t/open-material-mode/43590 "2026-08-07T14:23:21Z")
Is there anyone here who already owns a purchased license for open material mode? --- ## [Direct printing of small threads (eg. M3)](https://forum.formlabs.com/t/direct-printing-of-small-threads-eg-m3/46659)
**Author:** [@leonhart88](https://forum.formlabs.com/u/leonhart88)\ **Replies:** 19\ **Last updated:** [July 27, 2026, 7:48pm UTC](https://forum.formlabs.com/t/direct-printing-of-small-threads-eg-m3/46659 "2026-07-27T19:48:23Z")
Wondering if anyone here successfully prints M3 threads, and if so, whether there were any tricks required. There’s a particular part that I’m printing a large volume of which has some blind tapped M3 holes which look l… --- ## [3d Dental Models Misprints](https://forum.formlabs.com/t/3d-dental-models-misprints/46641)
**Author:** [@RobLaBerge](https://forum.formlabs.com/u/RobLaBerge)\ **Replies:** 1\ **Last updated:** [July 20, 2026, 1:57pm UTC](https://forum.formlabs.com/t/3d-dental-models-misprints/46641 "2026-07-20T13:57:43Z")
Need Help! Whenever I’m printing dental models with supports my models end up like the photo above. I’ve changed touchpoint size, raft height, model angles and density on supports. Printing without supports for the mo… --- ## [Horizontal Banding](https://forum.formlabs.com/t/horizontal-banding/46598)
**Author:** [@DasPrintHaus](https://forum.formlabs.com/u/DasPrintHaus)\ **Replies:** 6\ **Last updated:** [July 10, 2026, 8:44pm UTC](https://forum.formlabs.com/t/horizontal-banding/46598 "2026-07-10T20:44:12Z")
Hi folks, I have 2 questions. 0.05mm layer height and these MUST be printed perpendicular to the plate Firstly, I’m getting some banding on my prints. I believe this corresponds to where the “floor” of the print is co… --- ## [Slow floating resin](https://forum.formlabs.com/t/slow-floating-resin/46249)
**Author:** [@KuemmeMl](https://forum.formlabs.com/u/KuemmeMl)\ **Replies:** 6\ **Last updated:** [June 17, 2026, 6:28am UTC](https://forum.formlabs.com/t/slow-floating-resin/46249 "2026-06-17T06:28:09Z")
We recently received a new Form 4L. Since the initial resin loading, the printer repeatedly reports that resin is slowly flowing out of the left cartridge. When I moved the cartridge to the right slot, the issue disappea… --- ## [Forward-AM ST45B resin](https://forum.formlabs.com/t/forward-am-st45b-resin/46453)
**Author:** [@abheko](https://forum.formlabs.com/u/abheko)\ **Replies:** 0\ **Last updated:** [June 10, 2026, 10:26am UTC](https://forum.formlabs.com/t/forward-am-st45b-resin/46453 "2026-06-10T10:26:52Z")
Dear All! I’m using a lot of Forward-AM ST45B resin, but not on Formlabs printer. I’m thinking on the open material system to use the Formlabs Form 4 printer with this resin. Does anyone has experience if it works? I ha… --- ## ["Elephants Foot" brim](https://forum.formlabs.com/t/elephants-foot-brim/46381)
**Author:** [@rawnsley](https://forum.formlabs.com/u/rawnsley)\ **Replies:** 6\ **Last updated:** [June 5, 2026, 3:33am UTC](https://forum.formlabs.com/t/elephants-foot-brim/46381 "2026-06-05T03:33:12Z")
I’m printing a case on a Form 4 in White V5. It’s flat on the build plate for a clean surface and to eschew supports, but the first few layers bulge out like a brim. This should be a clean 90 degrees with no curve in or … --- ## [Recommended lubricants for Form 4 / 4L maintenance](https://forum.formlabs.com/t/recommended-lubricants-for-form-4-4l-maintenance/45785)
**Author:** [@raum](https://forum.formlabs.com/u/raum)\ **Replies:** 2\ **Last updated:** [June 4, 2026, 4:42pm UTC](https://forum.formlabs.com/t/recommended-lubricants-for-form-4-4l-maintenance/45785 "2026-06-04T16:42:11Z")
Hello Formlabs forum — I am performing scheduled maintenance on my Form 4 / 4L, and the maintenance manual recommends using Rheolube 362HB. However, this specific lubricant is not available in my region. I found an aero… --- ## [FORM 4 Tough 2000 v2 - Slow Tank Filling](https://forum.formlabs.com/t/form-4-tough-2000-v2-slow-tank-filling/46168)
**Author:** [@eufracio\_cueto](https://forum.formlabs.com/u/eufracio_cueto)\ **Replies:** 12\ **Last updated:** [May 18, 2026, 2:19am UTC](https://forum.formlabs.com/t/form-4-tough-2000-v2-slow-tank-filling/46168 "2026-05-18T02:19:18Z")
After using 3 material cartridges (resine Tough 2000 v2 - 1 liter) on my Form 4 printer, I found the slow filling warning always on screen, to solve this I manually discharge the resine form the cartridge to the tank (by… --- ## [Form 4 Flex plate handles changed?](https://forum.formlabs.com/t/form-4-flex-plate-handles-changed/46247)
**Author:** [@SCULPTURAMA](https://forum.formlabs.com/u/SCULPTURAMA)\ **Replies:** 4\ **Last updated:** [May 11, 2026, 5:30pm UTC](https://forum.formlabs.com/t/form-4-flex-plate-handles-changed/46247 "2026-05-11T17:30:14Z")
Have they changed the handles on the flex plate? There are two version, one with black plastic grips and one with bare metal handles. Anyone know which is V1 and V2? --- ## [Cupping mitigation extends print durations for parts with no cupping](https://forum.formlabs.com/t/cupping-mitigation-extends-print-durations-for-parts-with-no-cupping/46333)
**Author:** [@JulianW\_Emvexis](https://forum.formlabs.com/u/JulianW_Emvexis)\ **Replies:** 6\ **Last updated:** [May 11, 2026, 4:52pm UTC](https://forum.formlabs.com/t/cupping-mitigation-extends-print-durations-for-parts-with-no-cupping/46333 "2026-05-11T16:52:43Z")
Cupping mitigation (enabled through PSE) is great when geometry cannot be changed (customer geometry) or is otherwise undesirable. I understand how and why it drastically increases print times when cupping is present (m… --- ## [4L - "Download Logs" causes critical "Motherboard communication failed" error](https://forum.formlabs.com/t/4l-download-logs-causes-critical-motherboard-communication-failed-error/46371)
**Author:** [@cadesewa](https://forum.formlabs.com/u/cadesewa)\ **Replies:** 1\ **Last updated:** [May 11, 2026, 1:18pm UTC](https://forum.formlabs.com/t/4l-download-logs-causes-critical-motherboard-communication-failed-error/46371 "2026-05-11T13:18:49Z")
Hi all. We have a Form 4 and a 4L connected to a PC via USB. PreForm and the printer firmware are up to date as of May 7, 2026. Because we work with sensitive designs and components, we cannot connect the printers direc… --- ## [Form 4 Prevents Printing with Sufficient Tank Resin When Cartridge Is Empty (Errors 1.9.6 / 1.9.22)](https://forum.formlabs.com/t/form-4-prevents-printing-with-sufficient-tank-resin-when-cartridge-is-empty-errors-1-9-6-1-9-22/46261)
**Author:** [@Nihal\_Drotsa](https://forum.formlabs.com/u/Nihal_Drotsa)\ **Replies:** 10\ **Last updated:** [May 5, 2026, 11:37am UTC](https://forum.formlabs.com/t/form-4-prevents-printing-with-sufficient-tank-resin-when-cartridge-is-empty-errors-1-9-6-1-9-22/46261 "2026-05-05T11:37:40Z")
I have been using the Formlabs Form 4 for nearly two years and have generally had a stable experience. However, I have encountered a recurring issue related to resin usage and print initiation. The printer appears to ma… --- ## [Refilling Form 4 Resin Cartridge or Tank](https://forum.formlabs.com/t/refilling-form-4-resin-cartridge-or-tank/46135)
**Author:** [@payerle](https://forum.formlabs.com/u/payerle)\ **Replies:** 4\ **Last updated:** [March 24, 2026, 4:26pm UTC](https://forum.formlabs.com/t/refilling-form-4-resin-cartridge-or-tank/46135 "2026-03-24T16:26:40Z")
I have an empty tough 1500 V2 cartridge for my form 4 and one “backup” cartridge that has leaked in its shipping bag. Am I able to refill my original empty tough 1500 V2 cartridge with the resin from the leaking cartridg… --- ## [Missing parts in build - anyone else experienced this?](https://forum.formlabs.com/t/missing-parts-in-build-anyone-else-experienced-this/46165)
**Author:** [@smerrett](https://forum.formlabs.com/u/smerrett)\ **Replies:** 4\ **Last updated:** [March 16, 2026, 7:08pm UTC](https://forum.formlabs.com/t/missing-parts-in-build-anyone-else-experienced-this/46165 "2026-03-16T19:08:19Z")
I just had a very strange experience. Printing a full flex build plate on a Form4 with Tough2k V2. I have a custom “print on bed” profile which can result in some adhesion reduction but keeps the dimensions from blowing … --- ## [Dimensional Accuracy (Sorta?)](https://forum.formlabs.com/t/dimensional-accuracy-sorta/46157)
**Author:** [@DasPrintHaus](https://forum.formlabs.com/u/DasPrintHaus)\ **Replies:** 5\ **Last updated:** [March 13, 2026, 4:47pm UTC](https://forum.formlabs.com/t/dimensional-accuracy-sorta/46157 "2026-03-13T16:47:32Z")
I hope this is in the right spot :slight\_smile: I’m hoping to get a little insight from the community with an issue I’ve been having on printing a part. Quick background - I’ve been resin printing for a long time and re… --- ## [Tough 1500 v2 warping in Cure oven](https://forum.formlabs.com/t/tough-1500-v2-warping-in-cure-oven/46136)
**Author:** [@Lantech50](https://forum.formlabs.com/u/Lantech50)\ **Replies:** 7\ **Last updated:** [March 12, 2026, 11:14am UTC](https://forum.formlabs.com/t/tough-1500-v2-warping-in-cure-oven/46136 "2026-03-12T11:14:36Z")
From 4L and Cure L. we have one part that we print quite often. Sometimes the print distorts in the Cure oven and prevents the parts from being able to assemble…just sometimes. We have printed this part about 60 times, … [Next page](https://forum.formlabs.com/c/support-troubleshooting/form-4-4b/75.md?page=1)