Heat Distortion

Heat will distort thin wall parts (walls under 0.030” (0.75mm).  Parts A, B and C were post-cured in the LC-3DPrint Box.  The higher heat caused the parts to distort and swell.  Parts D and E were post-cured in the ProCure 350 UV chamber for a longer period at lower temperature and did not have any distortion or swelling.

Deciding on what UV post cure method to utilize will come down to part properties needed vs accuracy required.  

21.png
Figure # 16. Examples of heat distortion 

 

Make sure the parts are self-supported in the chamber.  Elevate the glass tray in the LC-3DPrint Box by ~75mm to move the parts away from the heat of the bulbs. 

No matter which UV method you choose, allow the parts to return to ambient temperature before removing them to avoid shocking them.  This can possibly lead to further distortion of the part.

 

The 25 parts in column A were post-cured in the LC-3DPrint Box.  The 25 parts in column B were post-cured in the ProCure 350 UV chamber.  Notice how much straighter the B parts are.  Again, you may achieve better mechanical properties with the higher heat in the LC-3DPrint box, but you may see more inaccuracies due to warp and growth/swelling. 

22.png
Figure # 17. Example of different post-cured unit results

 

Part A was post-cured in the LC-3DPrint Box.  Part B was post-cured in the ProCure 350 UV chamber.  Thin flat geometry will curl more in the higher heat environment. 

23.png
Figure # 18. Example of different post-cured unit results