Paulcheeba's S4U PTC heater holder plus extras

I recently purchased the S4U and had a PTC heater I had built for my used Mars 1 last year when I got into resin printing on the cheap. The PTC heater was designed by rsilvers and I found it on thingiverse (https://www.thingiverse.com/thing:3412516). I used the Moai version and used tinkercad to extend the height a bit to accommodate the wiring a bit better.

^My modified PTC Heater^

Since I didn't want to drill any holes, I modified an exhaust riser cover/adapter designed by Julien Mairy (https://www.printables.com/en/model/899843-adapter-for-usb-cable-on-elegoo-saturn-4-4-ultra) by increasing its depth to 10 mm and the cable hole to 8mm and turned it so the hole exits out of the left side rather than the bottom, which suited my cabling better. Then after 5 variations of creating a shelf that mounts to the existing exhaust screw holes, into and through Julien's adapter to the original cover plate. I mounted the magnets to the shelf and to the PTC heater so I could easily pull out the heater if I needed to.

^My modified adapter and the heater shelf I designed.^

The final product, working perfectly as intended, stays out of the way of the tray and build plate, keeps the internal temps to 26-30 Celsius and looks pretty boss. Well, it would look bosser, but I had a magnet come off the shelf and opted to use tin tape instead of glue (because it's awesome, heat resistant and can remove all the hair off an unsuspecting buddy's arm in milliseconds...). This was mostly due to me NOT modifying the magnet slots in the original file to accommodate the magnets I had on hand. I also used tin tape to mount the thermocouple to the base of the heater, which in any future iteration I would use glue and embed it into the print instead of mounting to the print.

Anyways here is the result:

^Heater mounted inside the S4U^

Things that I love about this design:

• It worked with my original DIY PTC Heater.
• I was able to mount the heater on a shelf inside the S4U without needing to modify the S4U, drill additional holes etc.
• The Heater is held about 1 cm from the back of the printer and with the adapter adding extra depth behind the heater, so there is good internal air flow to heat with.
• There is about 1 cm between the heater and the exterior perimeter of the resin tray, this works well with plate drippers (like this guy: https://www.thingiverse.com/thing:6686606).
• Doesn't interfere with the click-in drip tray in any way.

Costs about $75 CAD in total for the ptc heater, thermostat, power supply, magnets and filament. Which is on par with the current discounted pre-order price of the elegoo heater. However elegoo's heater didn't exist when I made my heater last year and the price will go up to $90+ CAD soon. Also of note, the PSU I used can power additional hardware, lighting, exhaust fans etc as it is a 150w 12v PSU and the heater is only 100w.

Print Settings

• Material: ABS/PETG/ASA
• Nozzle Size: 0.4mm
• Layer Height: 0.2mm
• Vertical Walls: 3
• Top/Bottom Layers: 3
• Infill: Shelf and PTC Heater - 100% (too thin for infill), Adapter - 20-30%
• Supports/Brims: Shelf - None, Adapter - None, PTC Heater - None