Kossel 220mm Hot Bed Spacers / Mounts

by peaberry, published

Kossel 220mm Hot Bed Spacers / Mounts by peaberry Dec 20, 2016
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These are spacers designed to mount a 220mm diameter hot bed to the Anycubic Kossel Linear (and other similar Kossel Delta printers). They're designed to fit a printer with 20x20x240mm extrusions (300mm triangle), using M4x10 socket headed screws and M4 square or T-nuts. The spacers are mounted 45mm from the end of the extrusion, and are shaped to fit the curvature of the bed at this position.

To provide clearance from the electronics, the spacers raise the hot bed 10mm above extrusion. The overall height is 13mm to be flush with the top surface of a 3mm thick hot bed.

There are two models: left and right handed, and 3x of each type need to be printed.

I've also added a PDF template for a heat shield, which is designed to sit between the electronics and hot bed. It has three rectangular feet which sit on the extrusion between each pair of spacers. For this I just used some 3mm hardboard covered in aluminium tape (as shown in one of the attached pictures).

After printing these, I also found these clips which work really well for mounting a 200mm glass bed to the heat plate: http://www.thingiverse.com/thing:1275136

There were no instructions to install the heated bed. Using the Anycubic Trigorilla Ramps 1.4 compatible board, I connected a 12V 20A PSU to both the 11A and 5A power inputs, connected the bed to the HOTBED output (don't do this: read the warning below), and connected the heat bed thermistor (NTC 3950 100K) to the T1 sensor input. In the Marlin firmware, I configured TEMP_SENSOR_BED as type 11 (QWG-104F-3950 thermistor). The lookup table was missing from my older version of Marlin, so I added this table from the current Marlin development trunk.

WARNING: after running the heated bed successfully for quite a few weeks, the power MOSFET on my Trigorilla Ramps 1.4 board overheated (with a really nasty burning smell). On the Trigorilla board, it's an STB55NF06 MOSFET (B55NF06 GK162 V6 CHN 618) in DPAK surface mount packaging, and I guess it just doesn't have enough PCB copper area to dissipate the heat, resulting in thermal runaway. The plastic connector next to it also melted. Now I have to repair it, and I'm thinking of replacing with an external TO-220 packaged MOSFET with a decent heat sink. After this experience, I would not consider using the on-board MOSFET again...

I'm now using an external MOSFET board (HA210N06) instead of connecting direct to the Ramps board.

Print Settings


Anycubic Kossel Linear






0.2mm layer height, 0.8mm shell thickness



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Did you ever get around to implementing an external TO-220 packaged MOSFET?
I would hate for mine to burn up and I'm all for preventing it if at all possible by going external.

Hi there, yes I've made a start on fixing this. I bought one of these boards (https://www.amazon.co.uk/gp/product/B06W5RJ9LY) which are based around the HA210N06 MOSFET. This board is widely available under lots of different brand names (maybe cheaper in some places).

The control input for that board can just be connected directly to the original hotbed screw terminals on the Ramps board, so it's pretty straightforward to wire up. I've already tested this complete set up with some test leads and it works fine, I just need to print a bracket to mount the external MOSFET and wire it more permanently.

It was a bit more complicated in my case, since the original MOSFET on my Trigorilla 1.4 board (STB55NF06 MOSFET) burnt out, so I had to repair that damage first. It actually caused the copper heatsink pad to de-laminate from the PCB, and melted the connector nearby! To fix that, I bought another STB55NF06, seated it on some copper tape, and soldered to the old pads, then stuck a small heatsink on top. This poorly heatsinked 55NF06 is never going to run a hotbed directly again, but I just wanted to restore the output screw terminals so I could connect them to the new external HA210N06 board. It only takes about 1mA to switch the external MOSFET, so that will be fine.

In conclusion: if you are running a hotbed at 12V, the MOSFET on the Trigorilla 1.4 board is completely unsuitable for the resultant current, as the heat-sinking is seriously inadequate. It really needs an external MOSFET board to drive the hotbed safely.

I just took delivery of this, I will try to wire it up over this weekend.
Thanks for your speedy reply.


Looks like a good choice Dennis.
I'll probably get around to finishing mine this weekend also!

Comments deleted.

Which paper Size is the pdf?

The PDF paper size is A3 which can be printed on a regular A4/Letter printer from Acrobat by selecting "Poster" to print two overlapping pages at 100% scale which can be glued to some board and used as a cutting template.

After printing, you can check it came out the right size by measuring the width of one of the three flat tabs which should be 70mm wide. Hope this helps!

yep helps me a lot Thanks!