I recently installed a more powerful blower fan on my delta (in my WT-LC electronics case https://www.thingiverse.com/thing:3052975), but damn if it doesn't sound like it will take off. To tame the fan a bit I needed a PWM controller (for a 3 wire fan).
This case has 2 options, a fan controller with 3 switch punchouts and an option to have the fan controller, with one switch and one LCD voltmeter. Both use the same base, but the top and face plate ("FP") parts will be unique. There is also a small compartment on top which can hold some spare nozzles, bubble gum wrappers or your "precious" (nah, probably wanna hang on to that).
These are the parts this was designed to use:
Round illuminated switches:
If the volt meter option is used, the small 2 wire volt meters (10x22.5mm) like one of these would work:
There is also a place to mount a 40mm fan in the base, I'd consider that an option, but I am using it since I am not sure how hot the PWM controller will get and it also will duct some airflow under my printer.
This case was designed to be complimentary to this design (below) which I have also mounted on my delta printer - this fan controller will go next to it on my printer.
The model I printed and posted the pics of, was a couple of revisions back. I have since made some improvements with the model posted here. The changes should improve the cable management and fix some issues with screw holes that were too small. Since the changes are minor, and I have printed a version that works fine, I can be pretty confident that the models posted should work also. If you make one please post a make or a comment to let me know your thoughts on it (and if there are any improvements needed).
2x M3x35mm screws
4x M3x6mm screws
2x M3x20mm (or longer) screws for the door hinge
2x M3 washers for the door hinge
2x M3 4mm x 4.3mm brass inserts for the door hinge
2x M4 or M3 screws and T-nuts for mounting to the 2020 extrusion
Several thin zip ties for cable management (optional)
4x M3x12mm screws (for mounting the 40mm fan)
4x M3 nuts (for mounting the 40mm fan)
Screws specific to the LCD module (I used cap head screws for these):
2x M2x5mm screws
1x M2x8mm screw (used for the clip to hold the LCD wires)
The models are not oriented for printing, see the pic for how I set them up. I printed these in 0.2mm resolution and used supports everywhere. You will probably need to rotate some parts and use Cura's "Lay Flat" feature/button on some of these. I posed a screencap from Cura which should give an idea on how I oriented the parts for printing. I found that tree supports worked really well on these parts.
STEP files are provided for easy remixing.
Jan 12, 2019: I found that the face plates which are cosemetic, did not fit the switches that arrived today. I updated the files to expand the holes for the switches just a bit and am printing them now. I also updated the "top" parts so that the switches can go in either way (the switches I received would have been mounted with the "O" indication for off positioned at the top, based on the old design). All the files are now updated here.
Feb 7, 2019: I uploaded a new version of the faceplates though I don't recall there were any changes to them I wanted to have them on the same version as the others. I tested the switches today and they fit (though the elephant foot needs to be removed otherwise it will be tough to get them in). I posted a pic of mine, with the switch installed, however I am currently not using it so can't show it lit up and cool looking. Moving this from work in progress.