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Customize your build: Check I have this to exclude parts you own. Toggle Buy / Print / CNC on fabricated parts. Click a supplier card to mark it preferred. Then Export JSON (above, next to search) → paste into your AI assistant for a priced buy list.

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M3-CRETE Bill of Materials — 66 Parts

Machine-readable JSON available at /bom/data.json

Category	Part	Qty	Type	Description
Frame & Structure - Aluminum Extrusions	2080 V-Slot Aluminum Extrusion (1200mm)	11 lengths	Buy	Main frame horizontals and gantry beam. V-groove rails on all 4 faces for wheel carriages.
Frame & Structure - Aluminum Extrusions	Frame Stiffener — Long Span Reinforcement	4 bars (1.2m each)	Buy	Required for X-axis spans exceeding 1.5m (M3-2 and M3-4).
Frame & Structure - Aluminum Extrusions	2040 V-Slot Aluminum Extrusion (1200mm)	4 lengths	Buy	Vertical posts (Z-height). 1200mm gives ~1000mm usable Z travel.
Frame & Structure - Aluminum Extrusions	2040 V-Slot Aluminum Extrusion (1000mm)	12 lengths	Buy	Cross braces, cable chain mounts, electronics panel rails, and accessory mounting.
Frame Hardware & Brackets	Heavy Duty Corner Brackets (20-Series)	40 pieces	3D Print	Frame corner connections for V-Slot 20-series. Printable saves $200+.
Frame Hardware & Brackets	Straight Line Internal Connectors (20-Series)	16 pieces	Buy	Splice connectors for modular X-axis extension.
Frame Hardware & Brackets	T-Slot Drop-In Nuts M5 (20-Series)	3 packs of 100	Buy	300 total. Spring-loaded drop-in style recommended.
Frame Hardware & Brackets	Eccentric Spacers (V-Slot)	28 pieces	Buy	Required for V-wheel preload adjustment on all motion axes.
Frame Hardware & Brackets	Adjustable Leveling Feet M16	4 pieces	Buy	Critical for leveling on uneven job-site floors. 1000lb-rated per foot.
X-Axis Motion System	NEMA23 Stepper Motor (X-axis, 8mm shaft)	1 motor	Buy	8mm shaft variant. TMC5160 StallGuard for sensorless homing. 3Nm minimum.
X-Axis Motion System	GT2 Timing Belt 10mm (Reinforced)	8 meters	Buy	X-axis drive belt. Gates PowerGrip GT3 preferred.
X-Axis Motion System	GT2 Pulley 20-Tooth (8mm Bore)	4 pulleys	Buy	Drive and idler pulleys. Must match 8mm motor shaft.
X-Axis Motion System	Idler Pulley Mounting Plate	14 plates	Buy	Mounts smooth idler pulleys at belt return ends.
X-Axis Motion System	V-Groove Delrin Wheels (Polycarbonate)	8 wheels	Buy	Dust-resistant, critical for concrete environment.
X-Axis Motion System	X-Axis Carriage Plate Assembly	1 assembly	3D Print	Carries the 1.5kg printhead. Print saves $70+ with CF-Nylon/ABS.
Dual Y-Axis Motion System	NEMA23 Stepper Motor (Y-axis, 8mm shaft)	2 motors	Buy	Dual motors for anti-racking. TMC5160 StallGuard compatible.
Dual Y-Axis Motion System	GT2 Timing Belt 10mm (Reinforced)	8 meters	Buy	Dual Y-axis belts. ~3m each side, 6m total.
Dual Y-Axis Motion System	GT2 Pulley 20-Tooth (8mm Bore)	8 pulleys	Buy	Multiple pulleys for dual Y system. 8mm bore.
Dual Y-Axis Motion System	V-Groove Wheels (Polycarbonate)	16 wheels	Buy	Better load distribution on gantry beam carriages.
Dual Y-Axis Motion System	Y-Axis Gantry Plates	2 plates	3D Print	Connects gantry beam to Y-rail carriages. Print saves $160+.
Quad Z-Axis System (Self-Tramming)	NEMA23 Stepper Motor (Z-axis, 8mm shaft)	4 motors	Buy	Four independent motors for auto-tramming via Klipper Z_TILT_ADJUST.
Quad Z-Axis System (Self-Tramming)	GT2 Timing Belt 10mm (Z-axis)	12 meters	Buy	Belt-driven Z. ~3m per Z corner, 12m total.
Quad Z-Axis System (Self-Tramming)	GT2 Pulley 20-Tooth (8mm Bore, Z-axis)	8 pulleys	Buy	Drive + idler pulleys for belt Z. Full parts commonality with X/Y.
Quad Z-Axis System (Self-Tramming)	V-Groove Wheels (Z-axis Carriages)	12 wheels	Buy	3 wheels per corner carriage on 2040 vertical posts.
Quad Z-Axis System (Self-Tramming)	Z-Axis Carriage Plates	4 plates	3D Print	Connects gantry frame to V-wheel carriages on vertical posts.
Quad Z-Axis System (Self-Tramming)	Z-Axis Motor Mounts	4 mounts	3D Print	Print saves $90. Interfaces NEMA23 to 2040 V-Slot vertical post.
Electronics & Control System	BTT Kraken Mainboard	1 board	Buy	8x TMC5160 stepper drivers. X + 2Y + 4Z + Extruder.
Electronics & Control System	Raspberry Pi 5 (8GB RAM)	1 computer	Buy	Runs Klipper firmware. 8GB for large print files.
Electronics & Control System	7-inch Touchscreen Display	1 display	Buy	User interface via KlipperScreen.
Electronics & Control System	Power Supply 24V 600W	1 PSU	Buy	MeanWell. 600W handles 7 NEMA23 steppers + accessories.
Electronics & Control System	Emergency Stop Button	1 switch	Buy	NC contacts. Pressing opens circuit and kills 24V via contactor.
Electronics & Control System	Cable Drag Chain (Sealed)	4 meters total	Buy	Enclosed type for concrete dust protection.
Electronics & Control System	Shielded Motor Cable - Flex-Rated (18AWG 4C)	20 meters	Buy	Continuous-flex drag-chain-rated. For X, Y, and extruder motors.
Electronics & Control System	Shielded Motor Cable - Static (18AWG 4C)	10 meters	Buy	For 4 stationary Z-axis motors.
Electronics & Control System	GX16-4 Aviation Connector Sets	10 sets	Buy	Quick-disconnect for all 8 stepper motors. IP65 when mated.
Electronics & Control System	Power Wire — 12AWG Silicone (Red + Black)	4m total	Buy	PSU 24V output to BTT Kraken main power input.
Electronics & Control System	Distribution Wire — 18AWG (Red + Black)	6m total	Buy	24V branch distribution, accessory power, E-stop signal loop.
Electronics & Control System	Ferrule Crimping Tool + Assortment Kit	1 kit	Buy	Every stranded wire into a screw terminal must have a ferrule.
Electronics & Control System	IEC C14 Power Inlet w/ EMI Filter & Fuse	1 unit	Buy	Panel-mount AC inlet with integrated EMI filter and fuse holder.
Electronics & Control System	24V Safety Contactor / Relay	1 unit	Buy	E-stop cuts 24V power via this contactor. 30A contacts minimum.
Electronics & Control System	24V-to-5V DC-DC Buck Converter (5A)	1 unit	Buy	Powers Raspberry Pi 5 and touchscreen from 24V bus.
Electronics & Control System	DIN-Rail Terminal Block Kit + Rail	1 kit	Buy	10-position terminal blocks, end stops, jumper bars, and 0.5m DIN rail.
Electronics & Control System	Nylon Cable Gland Assortment	1 50-pack	Buy	IP68 cable glands for every wire entering the control panel.
Electronics & Control System	Snap-On Ferrite Cores (13mm ID)	8 pieces	Buy	One per stepper motor cable at controller end. Suppresses EMI.
Electronics & Control System	Cable Sleeving, Labels & Tie Kit	1 kit	Buy	PET braided sleeving, UV-resistant cable ties, wire labels.
Concrete Extrusion System	Progressive Cavity Pump	1 pump	Buy	REFERENCE ONLY — not included in motion system kit.
Concrete Extrusion System	NEMA23 Planetary Geared Stepper (10:1)	1 motor + gearbox	Buy	Drives PC pump rotor. ~6Nm output torque at 50-300 RPM.
Concrete Extrusion System	External Stepper Driver — TMC5160 (48V)	1 driver board	Buy	Drives geared pump motor. Higher current (6A) and 48V.
Concrete Extrusion System	Progressive Cavity Pump Element (Rotor + Stator)	1 set	Buy	Core pumping element. For mortar/concrete with aggregates up to 2-6mm.
Concrete Extrusion System	Pump Drive Coupling — Universal Joint	1 assembly	Buy	Converts motor rotation to rotor orbital motion.
Concrete Extrusion System	Pump Housing & Bearing Assembly	1 assembly	CNC/Fab	Encloses rotor/stator and provides bearing support.
Concrete Extrusion System	NEMA23 Motor for Extruder (Direct Drive)	1 motor	Buy	Direct-drive option for simpler pump setups or peristaltic.
Concrete Extrusion System	48V Power Supply for Pump Driver	1 PSU	Buy	Only needed if running external TMC5160 at 48V.
Concrete Extrusion System	Material Hopper 20-Liter	1 hopper	3D Print	Material reservoir above the pump. HDPE or stainless.
Concrete Extrusion System	Concrete Nozzle Assembly	1 assembly	CNC/Fab	Replaceable-tip design for different layer widths (20-40mm).
Concrete Extrusion System	Tubing & Quick Fittings	1 kit	Buy	Pump to nozzle material flow. Reinforced hose rated for concrete slurry.
Concrete Extrusion System	Extruder Mounting Bracket	1 bracket	3D Print	Mounts extruder pipe to X-axis carriage plate.
Fasteners & Hardware	M5 Socket Head Cap Screws	1 500pc kit	Buy	Primary structural fasteners for 20-series V-Slot frame.
Fasteners & Hardware	M3 Socket Head Cap Screws	1 500pc kit	Buy	Electronics mounting and small parts.
Fasteners & Hardware	Washers & Lock Washers Assorted	1 kit	Buy	Prevent loosening from vibration. Nord-Lock recommended.
Fasteners & Hardware	Heat-Set Inserts M3/M5	1 200pc kit	Buy	Essential for threaded connections in 3D printed parts.
Optional Upgrades	Polycarbonate Enclosure Panels	1 set	Buy	Dust containment for indoor use.
Optional Upgrades	LED Work Lighting	1 kit	Buy	Work area illumination — 24V LED strips.
Optional Upgrades	Camera Module for Monitoring	1 camera	Buy	Remote print monitoring via KlipperScreen or Mainsail.
Optional Upgrades	HEPA Air Filtration	1 system	Buy	Concrete dust particle capture for indoor operation.
Optional Upgrades	Carbon Fiber Stiffener Bar (2080 Rail)	4 bars (2m each)	Buy	20-30% additional stiffness on long spans. Structural epoxy bond.

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Pending Supplier Submissions

CAD Library — STEP File Index

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