Form 4 Initial Impressions from experienced resin user

Hi, I’m Ben, and I recently took delivery of a Form 4, Form Wash and Cure (2nd Gen). I’m a solo entrepreneur, and I make custom motorcycle parts and accessories (www.adventuresonzero.com) for electric motorcycles. I also have two YouTube channels, one for motorcycle adventures (www.youtube.com/c/adventuresonzero) and woodworking/making (www.youtube.com/c/benmarshalldesigns).

The Form 4 is not my first 3D printer, nor first resin printer. For the last 4 years, I’ve been using the Prusa SL1S (and prusa FDM printers) with varying 3rd party resins, mostly the ABS-like. I hit a bottle neck for producing prints to meet the demands I was getting, which recently shot up quite a bit. Thankfully, the spike in sales helped me fund the purchase of the Formlabs kit I have now! I’ve always wanted access to Formlabs resins, but after the Tough1500 v2 came out earlier this year - I knew I needed to take the plunge.

I’d like to share my initial impressions of the Form 4, in the hopes that it will help others make the right decision on whether the form 4 is right for them.

Some key experiences that stand out in my mind after running my first production run print with Black V5 resin:

  • Low Odor: Huge difference in odor vs consumer resins. Formlabs Black v5 has a slight smell of latex paint, similar to what you’d pick up in a Lowes/Home Depot. But it’s not an odor that occupies the room. Every consumer grade resin I used had a strong odor, and I had to use a HEPA and Carbon filter to eliminate the smell. The only thing I smell now when in the room is the occasional whiff of IPA from the Form Wash if a print has recently raised out of a wash.
  • Clean Work Area: No matter how hard I tried to keep my area clean with the SL1S, it was nearly unavoidable to NOT spill or drip IPA between a rinse and wash tank. I have a steel table for my resin printers, and I was constantly wiping the surface down with paper towels and IPA to keep it clean. With Formlabs systems, my table has remained clean, as have my nitrile gloves. This really has been an incredibly pleasant and clean experience.
  • Ease of Use: the Formlabs ecosystem is quite streamlined compared to my experiences in the past. Consumer grade resin printers and resins have a learning curve and I had to come up with my own processes to get the results I needed. With Formlabs and PreForm, I spent little time finessing my prints for supports. I know that my experience with other printers has helped me here, as there was a lot of trial and error to get prints right back then, so I have an eye for it now. But even when reducing my support touch points to almost nothing - prints still came out perfect and literally fell off the supports after washing (this is a good thing, lol). I have to split my time between everything of running a business, including content production and traveling - and formlabs gives me the opportunity to focus on other things as I’m not worried about whether my prints will come out ok. Time has been saved with the Form 4 ecosystem.
  • Print Quality: my accessories/parts are by no means complex, but the quality and dimensional accuracy is unmatched. Even my post processing time/effort has been cut in half, if not more. I no longer have to sand faces down from support marks. My parts are nearly ready to seal with UV resistant out of the Form Cure.

One thing that was frustrating though, and it may have been a one time instance, was that my printer and almost all the other components left from Pennsylvania (?), but my mixers left from California. That meant my printer was here on a Monday, but I couldn’t print until Friday. Not a big deal, but kind of the only part of the process of ordering and delivery that I experienced.

Overall I’m beyond excited that I have the Form 4 - and I’m really excited to continue developing, prototyping and eventually selling my products to other riders around the world. Hope this post helps anyone scouring the forums for insights like I did prior to purchase.

I intend to start making content soon on the Form 4, as there really aren’t too many user videos that focus on engineering prints. Figurine and model print seem to be the predominant focus on resin printer videos, which is not helpful for me.

Thanks and I’m happy to answer any questions. happy printing.

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On the SL1S, I could only print one at a time and had to add quite a few supports to get consistent results. Compared to the 14 brackets I have on the form 4 above, with very little supports. The angle of this print is due to the size limitation of the SL1S. if it were larger, I likely would have a similar support structure to that of the form 4 print, but still not nearly as many per print.

external supports literally fell off, leaving no marks or raised marks on the surface. Internal supports inside the webbing takes only seconds with a pointy hobby knife.

This would have taken me about 1.5 weeks on my other printer, and that’s not counting post print work and cleanup. Now it can be done in half a day (from hitting print to final coat of UV sealant drying).

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I have no experience with the SLA side but when I was researching SLS options Formlabs was far and beyond the most well thought out workflow, IMO. I’m very happy with the ecosystem.

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I would love to play with their SLS system - but that’s just way too much for my low volume production, lol. I could certainly make all of my accessories with just that machine

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Welcome to the FL ecosystem :fire:

In regards to odor, this will really vary depending on the resin you’re using. Some of the engineering ones are very smelly, so be warned :upside_down_face:

Also your parts look great! After seeing the pictures, I bet you can print these successfully without any supports at all…which would make your life super easy. Vertical, straight on the build plate without supports is always ideal. If you experience elephants foot, there’s a support article online explaining how to fix that too. Preform is generally very conservative and once you get more familiar with what the FL machines can get away with you can really dial down the support size and density.

Like you, I’m one of the few engineers doing resin work and also making content. My YouTube is here: https://youtube.com/@emberprototypes :slightly_smiling_face:

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Thanks! Good to know about the different resin odors, which ones are the strongest in your experience? I think the other resins that I want to use next are the fast model resin, maybe Tough2k, and then the silicone resin. Appreciate the tip on supports for the brackets, give how the body does taper with vertical portions, I think you’re correct that I could print these without supports. I’ll have to try that next. I’ve got a .6 chamfer on these, so there’s very little elephant’s foot at the build platform.

I’ve checked out your channel before, and commented on your solvent recycler video. I honestly think IPA recycling is an unaddressed problem in the printing niche, and someone should come up with a desktop/benchtop recycler that doesn’t cost as much as the industrial options.

I checked out a few used options in my area, and the most ‘affordable’ one is around $2500 :face_with_spiral_eyes: I’m not at the volume of parts to warrant the cost, but if there was an option to recycle 1-2 gallons of IPA at a time, and it was around $1k - I’d buy it in a heartbeat. It’s one of the few pieces of equipment that can pay for itself no matter what.

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Some of the stinkier ones are White V5, Elastic, Flexible. Rigid and Tough resins smell a bit too but not terrible.

Yeah, because of your gradual overhangs I think those areas don’t need supports at all. The other thing is even with sudden cross sectional area changes, the Form 4 handles those much better than the previous generation because it does one cross section at a time. I am fairly confident (with my limited knowledge of your part) that it would work.

Hah yes, a benchtop recycler would be amazing, but I can understand why that doesn’t exist yet (liability & certification costs).

And yes, totally worth the spend once you get printing a bit more. I absolutely love mine.

Hi @Kemolagger

nice seeing you here, I’m glad you like the Form 4 so much, we’re constantly trying to improve our machines and workflows and the Form 4 Series is our best machine yet.
Our Form 1 and Form 1+ was using a “pour the bottled resin into your tank” approach and since we released the Form 2 in 2015 we didn’t want to ever go back to that system, as just like you mentioned it is almost impossible to keep a clean working environment.

Speaking of a clean working environment:
A steel table is super good for this, what we like to do is get a roll of one-use outdoor tablecloths, mount them to the side of our work surfaces, pull them over and work on that.
After a week or so, we take everything off the working surfaces, throw away the table cover and apply a new one.

I +1 @leonhart88 s list: I’m not very affected by harsh odors, but I personally also don’t like the flexible resins too much.

A couple of things I want to note:

For clearing out the odors, you can find an exhaust port at the back of your Form 4, which you can hook a hose to to vent the air outside.

You spoke of flexible materials, specifically the Silicone 40A one:
Make sure to check out the Using Silicone 40A article on our support pages, as this is a very special resin and you’ll need n-Butyl Acetate to properly wash it off.
As a beginner, I would highly suggest starting pit with the Flexible or Elastic resins, if you don’t specifically need it to be Silicone.
Speaking of post processing and flexible materials: try curing the flexible/elastic resins in a water bath inside the Form Cure, it’s an absolute game changer for these two in terms of stickyness after post processing.

IPA, recycling etc.
Yes, unfortunately there isn’t a lot for the non-industrial user out there.
What I’ve seen some people do is collect their saturated IPA, put it in see through containers near a window and letting it sit there. Over time and with exposure, the resin will congeal at the bottom of your container and you can get some okay-ish IPA back out of it, that you can use as a rough pre-bath for your parts.
Alternatively you can check out our Resin Washing Solution, which we’ve switched to here in the Berlin office for basically all of our prints (except the biomed ones).

Looking forward to your video and your perspective!

Kind regards
Jakob

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Thanks for the reply. I still have my cheap chinese HEPA/Carbon filter extractor I used for my Prusa, which pretty much captured everything no matter how bad the resin smelled. I will likely need both the 40A and the higher shore flexible resins. I need to waterproof some small electronics that require gaskets, and some interface washers that need to be squishy. The one thing that I don’t like about jumping to formlabs is the initial set up cost when getting new resins - guaranteed to started at $125 just for the tank and mixer :face_vomiting: . Thankfully those consumables last a very long time. I still have a little bit of stock left over from my previous prints, so hopefully I won’t need to pick up the elastic resins too soon.

I completely understand the hazards associated with distilling and recycling IPA - just wish someone would come up with a small, safe version for low volume. There are so many people that resin print, it’s an unmet need that has gone on for far too long.

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At least you’re coming into the ecosystem on the Form 4 rather than the Form 3…the consumable costs for the latter were quite high because of the limited tank lifetimes :cry:

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Consumable cost and lifespan was absolutely the reason why I didn’t get the Form 3. I was really excited when FL launched the form 4, and especially the 4L. If I had the output, would have certainly gotten the 4L.

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It’s definitely worth it. I think it paid itself off for me in the span of 2-3 months haha…

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impressive! i haven’t calculated how long it’ll take for my products to pay off the printer, im in a super small niche that’s seasonal. would love to hear/read how you fell into production work

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Shoot me a DM anytime on Instagram and we can chat! :slightly_smiling_face: