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2bd22b6 · · Sep 11, 2025

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Monstrosity

A printer designed in almost 24 hours somewhere around 40-50 hours.

alt text

but why?

Long story short, I didn't realize I still had time to submit things to Hack Clubs Highway event--until I had almost exactly 24 hours left. So, I made this. This monstrosity is a double hbot with a custom toolhead based on the Peopoly Lancer Long, capable of using a Bambu Labs A1 Mini build plate.

Second story slightly longer, I got some extra time when I was asked to do a re-review and decided to make a double hbot. Still the same size (roughly), but now it has twice the drive motors and triple the insanity. Hence the rename to being the Monstrosity.

the bom

PART UNIT COST QUANTITY SPONSORED? NOTES ROW COST SOURCE
BTT Octopus w/ 6 drivers $59.65 1 FALSE I'll be asking many companies for a sponsorship for a mainboard $59.65 link
Linear Rail Shipping $39.00 1 FALSE $39.00 link
10 pack of 1m 2020 extrusion $44.01 1 FALSE $44.01 link
Peopoly Lancer Long $42.00 1 FALSE $42.00 link
T8x4 Leadscrew 250mm $10.95 3 FALSE $32.85 link
MGN9H 250mm Linear Rail $9.97 3 FALSE Not told of the final cost until checkout because of custom length $29.91 link
MGN9H 316mm Linear Rail $9.97 2 FALSE Not told of the final cost until checkout because of custom length $19.94 link
GT2 6mm Belt 1600mm Belt $9.95 2 FALSE $19.90 link
Bed $17.19 1 FALSE Custom made by JLC or PCBWAY, probably sponsored. $17.19
Roborock CPAP Blower $15.76 1 FALSE $15.76 link
HGX Gear Set $15.06 1 FALSE $15.06 link
BTT Eddy Duo $26.26 1 FALSE $26.26 link
PEI Plate and Magnet $26.76 1 FALSE $26.76 link
GT2 6mm 20t Pulleys $6.26 2 FALSE $12.52 link
D5x30 Smooth Pin $11.50 1 FALSE $11.50
F695 Flanged Bearing 10x $6.87 1 FALSE $6.87 link
MGN12H 265mm Linear Rail $10.71 1 FALSE Not told of the final cost until checkout because of custom length $10.71 link
BTT EBB36 $9.40 1 FALSE $9.40 link
42mm Nema 17 Stepper Motor $4.72 7 TRUE LDO Sponsorship $0.00 link
Extruder Motor $18.30 1 TRUE LDO Sponsorship $0.00 link
4010 Hotend Fan $1.53 1 FALSE $1.53 link
100x T Nuts $0.99 1 FALSE $0.99 link

The overall cost is $441.81

wiring diagram

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note: this uses an old photo of the design, but the wiring is the same.

Credits

Thanks to the Voron team for publishing their kinematic Z mounts under the GPL license as part of the Voron Trident. This machine drew a lot of inspiration from the way the bed was used on the Trident.

The Monolith gantry by CloakedWayne was previously used in this design and a modified version of the 6mm belt tensioning system is used.

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