Print-in-Place KILLBOT mini v2.1

by ThreeHamsWillKillHim, published

Print-in-Place KILLBOT mini v2.1 by ThreeHamsWillKillHim May 21, 2016


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Even a vast robot army must begin with one tiny killbot...

UPDATE: Maximal thanks to all who uploaded pics of their killbots!

Print-in-Place sitting robot with articulated arms, legs and a head you can spin and lift from the bottom!

13 moving parts in total!

  • Head can be spun in place and controlled from between the legs. The head pops down 2mm to reveal the wheel that can turn and sorta bounce it.
  • Arms rotate at the shoulder and above the elbow, and bend 90+ degrees at the elbow.
  • Hands designed to hold on to a standard pencil (7.5mm).
  • Legs bend in three places, very human-like.
  • Hips move up 3mm to lock in standing position, for stability.
  • Love switch stuck in ON position, for safety.
  • Required support is included and minimal.

Please share pictures if you start your own army! :)

And if you have any issues, let me know in the comments, as I did debug this thing for days and I don't think it has any of the obvious issues PIP things sometimes have.

Inspired by the Maker sitting robot as well as other cool PIP toys (links below).

I went thru about 20 designs (~15 printed), testing hinges, joints and their tolerances, and I even tested a few versions where pressing a button/the head lifted the arms 90 degrees... (eventually worked but was too tall and clunky and also disables free rotation of the arms) Please check out versions 14 and 16 to see what I mean and get ideas, I'd love to see this used more appropriately, maybe not in a robot... To be frank, I'm not very happy with the head mechanism, I'm pretty sure if you're old enough to pretend it's a working robot, you might as well pretend you're not spinning the head with your fingers. Also the joint stiffness or lack thereof depends on material and temperature too much... But I'm moving on, probably to supine robots...

Maker robot http://www.thingiverse.com/thing:331035
Wip robot http://www.thingiverse.com/thing:1134277
Ratz http://www.thingiverse.com/thing:1532944
Crocz http://www.thingiverse.com/thing:941177

If you print it and love it, please do upload a Make and consider tipping! :)
Also please check my profile for my Etsy, Pinshape etc...

Print Settings

Printer Brand:



Ultimaker 2










I think 3 shells and 10% is better than 2 shells and 20%+ infill, tho it's only a little faster.

To clarify, when I say "no-support" I mean you don't need to add any. Still, each arm has a support I couldn't do without because often one or both arms get knocked over and ruined, in the direction perpendicular to the front. This then allowed me a couple of overhangs along the arm (tho early versions circumvented that).

Best of luck!

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Same here left shoulder needs fixing had to use a raft to print this arm kept falling off lol apart from that well put together thanks for the upload

I tried to print it, but left shoulder has fallen off. After studying the file in Z-SUITE (I have Zortrax M200 printer) there is a gap between build in support and bottom of the left shoulder. right shoulder is completly fine and it was printed ok. Model is simply not simetrical as far as arms are concerned.

I would say that's impossible but let me check first...

ok, let me know when you check it. I can provide you with screenshots that might help you to find what's wrong.

I did check. Looks symmetrical. Send away please...

How do we remove the supports from the arm?

I've had two prints fail to make the arms correctly. Any thoughts on what to try?


Print-in-Place KILLBOT mini v2.1
by perchik

I printed this third time lucky I had to print with a raft at a slower rate I have just upgraded my Anet A8 with titan and v6 and I thought I would print this as a first test to my delight not my printer thank god

I ended up with a successful print after 10 tries. It kept failing on the elbow-shoulder transition point. To successfully print, I automatically added supports in Cura, but had to change the settings to support overhangs of 50degrees or more. (The default is 60degrees). I did not remove the built-in supports, but ironically those supports were too steep and unsupported, so it automatically added supports to the supports.

It's a neat model, but the joints are all so loose that I can't get the robot to actually hold a pose. Perhaps slightly overprinting would fix it.

Same problem here. The built in supports is not actually supporting the arms so they end up printing midair. I will try and add manual supports to fill the gap and see if that works.

the supports should be able to support... do u mean that they topple/detach before the arms start?

maybe all they need is a flat base.

i'll do that and reupload.

Nov 13, 2016 - Modified Nov 13, 2016

The supports are attached to the base ok. Problem is that the sholders are not actually touching the supports. There is a gap between the sholder and the support.

i see... it's a 0.3mm gap, while most supports use 0.2 or 0.1...
what's the layer height u used?

Great little robot with kill instinct and a heart to switch on. My kids love this little guy. Printable in many sizes, but more fun and easier to move parts when it is printed bigger.