# Try to guess! **URL:** https://forum.formlabs.com/t/try-to-guess/21593 **Category:** General Discussion **Created:** [December 19, 2018, 8:39am UTC](https://forum.formlabs.com/t/try-to-guess/21593 "2018-12-19T08:39:43Z") **Posts on this page:** 1 **Showing post:** 4
### Author: ![JohnHue](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@JohnHue](https://forum.formlabs.com/u/JohnHue) #### Post date: [December 19, 2018, 10:20am UTC](https://forum.formlabs.com/t/try-to-guess/21593/4 "2018-12-19T10:20:20Z")
Print time inaccuracies have been reported several times, two of them being > [@Update On-Machine Job with Actual Print Time](http://forum.formlabs.com/t/update-on-machine-job-with-actual-print-time/19350/5): > > We do prototype printing for clients and the printing time is a major factor of our quote calculations. We have also found serious discrepancies between calculated and actual print times. Here are some of our recent results We have also sent this data to the agents in South Africa. Hopefully Formlabs can get to the bottom of this and issue a fix to the software. > [@Print Time Accuracy](http://forum.formlabs.com/t/print-time-accuracy/11111/31): > > It’s black. I’ll try shaking more next time. Issues arround resin sensing have been reported too. I am under the impression that Formlabs is in a kind of a dead end with the resin sensing because it’s a mix between open loop and closed loop systems with very slow sensors and now they have to solve a bad hardware design decision with only being able to act on the software side… The resin level in the cartridge is an open loop system so they are very conservative with the estimate (which leads to early / frequent / repetitive warnings) and the resin level sensing int he tank is very slow. Both of these issues put together make for a very slow resin sensing loop which has to be performed very frequently when resin level is estimated as low in the cartridge, to be sure to avoid not having enough resin in the tank. --- _[View the full topic](https://forum.formlabs.com/t/try-to-guess/21593)._