Universal and CFS compatible Dryer / Trockner

Update - adding a 5015 6000rpm ballbearing blower on each side of the lid as seen in the picture you get pretty much even temperature distribution throughout the chamber and it works perfectly as a dryer. 50°C set point get you 50-  51°C throughout the chamber. Wire them in parallel with the intake fans, i.e. all the red wires together and all the black wires together.

I used the drybox design of the linked dryer but modified most of it.  My design uses an old Ender 3 PSU (Meanwell LRS-350) so everything runs on safe 24V

Per CFS your powersupply needs to supply about 100W, so spec accordingly.  2 Dryers per PSU work well so that the PSU casing is still fairly compact.

The controllers are integrated into the PSU in order to have fewer seperate components and can be wallmounted behind the CFS, although I did not design a mount yet.

PART LIST

You will need the following components PER CFS (about 15€ excl. PSU)

• 1x 24V 100W PTC Heater

https://de.aliexpress.com/item/1005009286461778.html

• 1x 150°C KSD301/303 Thermal switch - for safety

https://de.aliexpress.com/item/1005007389882438.html

• 1x 24V W32131 Thermal Controller

https://de.aliexpress.com/item/1005006054004645.html

• 2x 24V 4010 Fans

https://de.aliexpress.com/item/1005003371996395.html

• Update - 2x 5015 6000rpm ballbearing blowers

https://de.aliexpress.com/item/1005007606844263.html

• 1 Set of GX12 5Pin connectors - Mine is mounted on the PSU, but I recommend it on the Dryer

https://de.aliexpress.com/item/1005008859055554.html

• 7 core 0,5mm^2 Cable 150cm long

• Some heat shrink tubing

• M3 4,2mm OD Heatset inserts - I used 3mm but anything under 6mm will work

• M4 5mm OD Heatset inserts - anything under 8mm will work

TOOL LIST

• Soldering iron

• Crimping pliers (can be avoided with more soldering)

• Side cutter

• Lighter - for the heat shrink tube

• Drill and drill bits

MATERIAL + PRINTING GUIDELINES

I printed the Dryer Case out of PPA to withstand generally high temperatures. I would recommend Some PA, preferrably PAHT as a minimum.

I printed the diffuser out of PPS to withstand constant heat, but again PAHT would probably suffice.

If the fans ever break down, the thermal switch should trip long before the material gives in.

The PSU Housing can be printed out of PLA or ABS or whatever you have lying around.

If you can solder, I would rate this project as beginner friendly if you wire everything permanently - not advisable for abvious reasons…

Unfortunately soldering the GX Connectors is a bit tight and bump this up to an intermediate difficulty… remember to use heat shrink on the soldering spots to prevent shorts at the back of your GX connector.

Feel free to remix the .step files to use easier connectors though.

ALL PARTS SHOULD IMPORT WITH THE CORRECT ORIENTATION

ONLY THE PSU NEEDS SUPPORTS

ASSEMBLY GUIDELINES

For those with a stealthpress or similar, I included an alignment tool :)

The thermal switch can be mounted without threaded inserts. Just go straight into the material (Assembly Guide 1)

The PTC is mounted on top of that (Assembly Guide 2)

The Thermistor is mounted on the side, again without a threaded insert. Straight into the plastic.

The Diffuser is just inserted through the back of the faceplate and held in place by squeezing it against the PTC Heater

The Drill guide is for 2mm pre drilling. Use pieces of filament to roughly keep it in place as you drill. The Hole for the cable will likely need to be drilled out with a step drill, use spiral drill bits for as long as possible.  Careful, it will pull the step drill into the material. Hold it back so it doesn't go to fast and crack the lid. The other holes are drilled to 5mm.

RECOMMENDED SETTINGS

Make sure to longpress SET on the controller and check that

P0=C (Celcius)

P1=H (Set to Heat) 

P2= 0,5 (Hysteresis)

The rest isn't important.

short press SET and set target to 65 C.  Perfect for PLA, reaches about 40 C - 45 C at the front and doesnt soften the PLA spools in slot 1,2,3, or 4

 I am working on the addition of 5015 blowers to the rear sides in order to increase air circulation Update - with the 5015 blowers the set point will be reached throughout the chamber. Lower the set point to 50°C for PLA