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Light intensity output differences beween resin 3D-printers

All Liqcreate resins are UV-curable 3D-Printing resins, which means that they have a designed reactivity to specific light. This reactivity controls how the resins behaves in the printer and during UV post-curing. In this article we explained that specific parameters about its reactivity are the Critical Enegergy (Ec) and the Depth of Penetration (Dp), two values which can be found for all Liqcreate materials in their corresponding Technical Data Sheet. The resins are tested after production to have the same curing behaviour every batch. If there are too big difference within one printer, or between different printers, this can cause issues. Especially with the knowledge that LED’s will reduce power when they age. And aging is accelerated at higher temperatures. In this article we test the light out put of a few different printers from the same model to see how stable the output of the printers are. We thank our partners for the access to these printers and support!

UV stability 405nm output resin 3D-printer White label OEM private label 3D-printing photopolymer resin 3dprint resina harz clear blue black grey white

What is the UV power, stability and output of different printers?

We measured a bunch of 405nm LCD printers in our lab and used 9 measurements per printer to check its stability. These were measured across the build plate in a structural manner, 3 on the left side from top to bottom of the LCD screen, 3 in the middle and 3 on the right with the same structure. See the table below for the measurements. It should be noted that most printers are used quite some time and might have lost some of its power over-time. See the complete data-set in the appendix below.


Measuring the UV output of the same printer with different usage time and age

Within our and partners facilities we found 4 models of the Anycubic Photon Mono with different ages and run-times. In the table below you can find the measurements and percential deviations within the measurement of one printer.

Printer UV power of printer Average power (mW/cm^2) Deviation (%)
Photon Mono [1] 100% 4,63 6,3%
Photon Mono [2] 100% 4,71 3,7%
Photon Mono [3] 100% 4,72 8,8%
Photon Mono [4] 100% 4,65 6,1%

Surprisingly the average UV-output, measured with the 405nm Chitu Systems UV-meter was quite similar. Which is a very good sign. However, some printers were more stable compared to others. Lets look at the raw data:

Printer Anycubic Photon Mono (1) Average 4,631 9 spots:
UV power 100% Min 4,307 7,0% 4,766 4,42 5,126
date 16-2-2023 Max 5,126 10,7% 4,371 4,587 5,064
STDEV 0,29334 4,307 4,32 4,72
% dev 6,3%
Printer Anycubic Photon Mono (2) Average 4,709 9 spots:
UV power 100% Min 4,44 5,7% 4,744 4,68 4,974
date 20-2-2023 Max 4,981 5,8% 4,61 4,981 4,751
STDEV 0,17313 4,44 4,69 4,511
% dev 3,7%
Printer Anycubic Photon Mono (3) Average 4,721 9 spots:
UV power 100% Min 4,146 12,2% 5,312 4,812 4,802
date 20-2-2023 Max 5,412 14,6% 4,6 4,146 5,412
STDEV 0,41378 4,497 4,17 4,738
% dev 8,8%
Printer Anycubic Photon Mono (4) Average 4,654 9 spots:
UV power 100% Min 4,11 11,7% 4,507 5 4,557
date 20-2-2023 Max 5,014 7,7% 5,014 4,891 4,758
STDEV 0,28476 4,11 4,362 4,69
% dev 6,1%

If you take into account the high and low spots, the differences can be seen like this:

Photon Mono overview: Average % dev  from av. STDEV % Max Min
Anycubic Photon Mono (1) 4,631 99,0% 6,3% 10,7% 7,0%
Anycubic Photon Mono (2) 4,709 100,6% 3,7% 5,8% 5,7%
Anycubic Photon Mono (4) 4,654 99,5% 6,1% 7,7% 11,7%
Anycubic Photon Mono (3) 4,721 100,9% 8,8% 14,6% 12,2%
Average: 4,679

Meaning that in average the printers have similar UV intensity output, which is great. but within one printer there can be roughly 10% deviation in UV-power / UV-intensity, depending on the spot on the platform. so make sure that if you print a part in the middle, the sides might need just a bit extra exposure time to succeed.


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