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Z Axis Height Calibration
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After going through the information and possible solutions here and in https://blog.honzamrazek.cz/ I finally got to an acceptable calibration. It is not perfect, and cannot be as demonstrated by putting the 5mm cube in the center and at each corner of the printing area: the center one came out 5.06mm high, and each cornered one was 4.93mm. This shows that the FEP flexibility is also involved as a variable, makingan absolute correction impossible. As in any process, the matter is to determine a tolerance, in this case +- 0.05 to 0.10mm seems realistic and should work fine for most applications. A smaller tolerance can be achieved working in a reduced central area only.

Following the many different recommendations, I went through the following procedures.

(1) as described in hhttps://blog.honzamrazek.cz/, I got the spring washer in the Z motor replaced by an equivalent size washer and had the "silencer" flexibility cancelled (in my case, by epoxy gluing a 3mm thick acrylic spacer around the rubber, so as not to take the part out and alter the motor position).
(2) detecting the FEP is not tightly pressed against the LCD, I leveled the build plate using a thick 0.23mm sheet of paper instead of a regular 0.10mm bond. That took care of it, and avoided having to rehabilitate the set zero option in Gcode and manually adjusting it every time. Instead, the original and easy Elegoo setting Home as Zero works fine.
(3) following a comment on drilling the build plate, and inspired by the already drilled one on the Kalend D100 (compatible with the Mars, by the way, available on Aliexpress), I drilled 6 holes at ø3mm and 20mm apart, centered along the width, the purpose being to help the resin flow. As the holes are precisely aligned along the central line on the ChihTuBox graphic, at the intersection of 1, 3 and 5cm on left and right from the center, I can place the models either avoiding those spots or helping the resin to flow out of trapped areas.

I also feel there is an issue with some layers sticking to the FEP and pulling it up enough to not be released and then coming back down, eventually being released in a later pull up and down but then leaving a couple of layers missing, or taking the piece apart or pulling it off the build plate and stuck to the FEP. So the next thing will be to print after altering the Gcode to increase the total demoulding raise to 8mm instead of 6 (M8070 Z8), and the slow raise to 5mm instead of 3 (M8070 S5). Hopefully this may resolve a problem I have with a particular model design which started failing on the Photon after updating the firmware and Gcode. Apparently it had reduced this raising distance to shorten raise and fall time from 6.5 to 4.5 deconds, and all my prints started to separate in pieces where the exposed surface increased. Previous to the upgrade, that model had printed without issue. This same problem also happens on the Mars, and I caught it during a visual inspection being stuck already at that same point as the Photon, but casually raising the plate for inspecting forced it to release with a strong popping noise. I'll later mention if that change was positive and worth the printing time increase.
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Messages In This Thread
Z Axis Height Calibration - by admin - 10-16-2019, 11:56 AM
RE: Z Axis Height Calibration - by CPatrick - 10-17-2019, 04:46 AM
RE: Z Axis Height Calibration - by admin - 10-17-2019, 11:18 AM
RE: Z Axis Height Calibration - by oeildefaucon - 11-02-2019, 03:06 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 11-02-2019, 10:33 AM
RE: Z Axis Height Calibration - by oeildefaucon - 11-03-2019, 04:12 AM
RE: Z Axis Height Calibration - by marsman - 10-17-2019, 03:16 PM
RE: Z Axis Height Calibration - by admin - 10-17-2019, 03:52 PM
RE: Z Axis Height Calibration - by admin - 10-18-2019, 08:08 AM
RE: Z Axis Height Calibration - by Woodvaper - 10-18-2019, 10:57 AM
RE: Z Axis Height Calibration - by CPatrick - 10-20-2019, 08:02 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 10-20-2019, 10:56 AM
RE: Z Axis Height Calibration - by admin - 10-20-2019, 10:57 AM
RE: Z Axis Height Calibration - by mckeemorology - 10-21-2019, 07:48 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 10-21-2019, 09:45 AM
RE: Z Axis Height Calibration - by SpaceDandy - 11-14-2019, 10:12 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 11-14-2019, 10:33 AM
RE: Z Axis Height Calibration - by admin - 10-21-2019, 09:59 AM
RE: Z Achsenhöhenkalibrierung - by oeildefaucon - 10-29-2019, 01:00 PM
RE: Z Axis Height Calibration - by tbdad - 10-25-2019, 09:46 PM
RE: Z Axis Height Calibration - by admin - 10-26-2019, 12:18 AM
RE: Z Axis Height Calibration - by tbdad - 10-26-2019, 07:10 PM
RE: Z Axis Height Calibration - by PolymerChecker - 10-26-2019, 05:18 AM
RE: Z Axis Height Calibration - by admin - 10-26-2019, 02:19 PM
RE: Z Axis Height Calibration - by Marc_H - 10-26-2019, 08:41 AM
RE: Z Axis Height Calibration - by Marc_H - 10-26-2019, 10:21 AM
RE: Z Axis Height Calibration - by PolymerChecker - 10-26-2019, 04:16 PM
RE: Z Axis Height Calibration - by admin - 10-26-2019, 09:22 PM
RE: Z Axis Height Calibration - by tbdad - 10-27-2019, 01:41 AM
RE: Z Axis Height Calibration - by twoheadedboy - 11-01-2019, 02:19 PM
RE: Z Axis Height Calibration - by OscarW - 11-03-2019, 04:15 AM
RE: Z Axis Height Calibration - by oeildefaucon - 11-03-2019, 06:25 AM
RE: Z Axis Height Calibration - by OscarW - 11-03-2019, 08:10 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 11-03-2019, 10:33 AM
RE: Z Axis Height Calibration - by OscarW - 11-04-2019, 11:27 AM
RE: Z Axis Height Calibration - by bennymcl - 11-07-2019, 08:14 PM
RE: Z Axis Height Calibration - by PolkCountyMike - 11-08-2019, 07:19 AM
RE: Z Axis Height Calibration - by bennymcl - 11-08-2019, 07:50 AM
RE: Z Axis Height Calibration - by PolkCountyMike - 11-09-2019, 08:21 AM
RE: Z Axis Height Calibration - by admin - 11-12-2019, 01:58 AM
RE: Z Axis Height Calibration - by fotolub - 11-12-2019, 06:10 PM
RE: Z Axis Height Calibration - by admin - 11-12-2019, 10:31 PM
RE: Z Axis Height Calibration - by admin - 11-14-2019, 01:52 PM
RE: Z Axis Height Calibration - by SpaceDandy - 11-15-2019, 07:25 AM
RE: Z Axis Height Calibration - by admin - 11-15-2019, 11:19 AM
RE: Z Axis Height Calibration - by Snassek - 11-20-2019, 06:01 PM
RE: Z Axis Height Calibration - by usergoo - 12-02-2019, 08:40 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 12-02-2019, 10:51 AM
RE: Z Axis Height Calibration - by usergoo - 12-02-2019, 11:48 AM
RE: Z Axis Height Calibration - by Blackbird2016 - 12-03-2019, 12:21 AM
RE: Z Axis Height Calibration - by usergoo - 12-03-2019, 09:54 AM
RE: Z Axis Height Calibration - by geg81 - 01-18-2020, 10:14 AM
RE: Z Axis Height Calibration - by SnyggJohan - 01-19-2020, 02:04 AM
RE: Z Axis Height Calibration - by admin - 01-19-2020, 03:35 AM
RE: Z Axis Height Calibration - by tbuske - 02-20-2020, 03:52 PM
RE: Z Axis Height Calibration - by Michael - 02-29-2020, 12:48 AM
RE: Z Axis Height Calibration - by zace66 - 05-16-2020, 02:17 AM
RE: Z Axis Height Calibration - by marketmaster - 05-28-2020, 12:58 PM
RE: Z Axis Height Calibration - by Kirk444 - 03-19-2021, 06:58 PM
RE: Z Axis Height Calibration - by Dominic Ko - 10-17-2021, 10:30 PM
RE: Z Axis Height Calibration - by Aingree - 11-30-2021, 08:37 PM
RE: Z Axis Height Calibration - by rfresh737 - 05-21-2022, 03:10 PM
RE: Z Axis Height Calibration - by hmida01 - 12-04-2022, 05:25 AM

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