Floor Scraper v8 - A one pound 3d printed plastic combat robot.

This bot has successfully competed in multiple competitions within MACRO (www.macrobot.us) and at First State Fights. It has captured one third place, two second place and one first place trophies.

For some of its fights, check out MACROBot.US on YouTube

Included are both the STL files and the Fusion 360 models.

All screw holes, save the ones connecting the top and bottom parts are to be self tapped, by threading them into the plastic.

The four M3 nuts must be pulled into the top part. I used a longer M3 socket head cap screw with a washer under the head to pull the nut into the plastic and seat the nut permanently in the top (printed part).

The TPU armor (printed part) is wrapped around the top (printed part) and held in place by four M3 x 6 mm socket head cap screws. Make sure the square keys in the TPU armor slot into the square holes in the top.

The 5010 weapon rotor needs to be removed from the stator, and gently pressed into the tooth carrier (printed part), and then held in place with three M3 x 12 mm button head cap screws. Do NOT hammer the rotor into the tooth carrier, as the rotor will be damaged. Do NOT attempt to draw the rotor into the tooth carrier using the three screws, as they will strip out, and render the tooth carrier useless. Add the tooth (printed part) to the tooth carrier, using two M3 x 20 mm socket head cap screws to secure it.

The stator of the 5010 weapon motor must be secured to the top (printed part) using four M3 x 8 mm socket head cap screws, with M3 washers between the screw head and the top (printed part)

The weapon ESC is designed to be placed in the slot in the top (printed part) and held in place with small zip ties.

The power switch PCB MUST be soldered, prior to installation, as the heat of soldering will deform the top (printed part). Make sure you fit the parts prior to soldering, so you know where the wires can pass through without interfering with the switch operation.

The power switch PCB is retained in the bot by driving one M3 x 8 mm socket head cap screw through the center hole of the PCB and into the power switch retainer (printed part). Then, using two M3 x 8 mm socket head cap screws, drive the from the bottom of the bot, through the power switch retainer, and into the top (printed part).

Solder and heat shrink the black wires of the drive and weapon ESCs to the negative post on the XT30.

Solder and heat shrink the 50 mm (2inch) red wire to the positive terminal on the XT30. Solder the other end of the red wire to the power switch PCB.

Solder all the red wires from the drive and weapon ESCs to the opposite side of the power switch PCB, in such a way that when the battery is plugged in and the center screw is loose, no power flows to the ESCs. The center screw acts as the switching mechanism. When tightened down, it turns the power on, and when loosened, the power is cut.

The wheelhub (printed part) will need to be pressed on to the 3 mm D shaft of the N30 drive motor. Be careful not to damage the motor while pressing the wheel hub into place. The foam tires will need to be fitted to the wheelhub.

• One 5010 360 kv brushless motor (Weapon)

• One 12 amp brushless ESC - Recommend one with BL_Heli32 or BL_HeliS, programmed to be reversible (Weapon ESC)

• One 5Ax2 brushed ESC (Drive ESC)
• Two N30 12 volt 1000 RPM motors (Drive motors)

• Two Lite Flite 1.5" foam tires or 37 mm OD x 8 mm ID x 12 mm wide foam tires

• One BetaFPV 3S 300 mah S version (Long and skinny) LiPo battery
• One BMC PCB power switch - contact me
• One FlySky FS-I6 transmitter
• One FS2A receiver (for weight reduction)
• One XT30 male connector (Must mate with the battery connector)

• 50 mm (2 inches) 18 gauge wire (silicone jacket recommended) - Red (from XT30 to power switch PCB)

• Three M3 x 12 mm button head cap screws (Weapon rotor connection to tooth carrier)

• Four M3 x 8 mm socket head cap screws (Weapon stator to top connection)

• Four M3 washers (7.5 mm OD max) (Weapon stator to top connection)

• Four M3 x 12 mm socket head cap screws (Top to bottom connection)
• Four M3 washers (7.5mm OD max) (Top to bottom connection)

• Four M3 nuts (5.5 mm across the flats) (Top to bottom connection)

• Two M3 x 20 mm socket head cap screws (Tooth to tooth carrier connection)

• Four M3 x 6 mm socket head cap screws (TPU armor to top connection)

• Three M3 x 8 mm socket head cap screws (Power switch retainer through power switch PCB into top connection)

• Four small zip ties to secure weapon ESC and wires in the weapon ESC channel

All parts were printed on a stock Ender 3.

Strongly suggest using Duramic 3D PLA+ (Red and black both perform very well)

• 0.4 mm nozzle

• 0.28 mm layer height

• One top plate - PLA+ (3.2 mm walls, 1.4 mm top/bottom, 100% infill, supports needed) - 106 grams predicted
• One bottom plate - PLA+ (3.2 mm walls, 1.4 mm top/bottom, 100% infill, no supports needed) - 26 grams predicted
• Two wheel hubs - PLA+ (3.2 mm walls, 1.4 mm top/bottom, 100% infill, no supports needed) - 3 grams predicted
• One tooth carrier - PLA+ (3.2 mm walls, 1.4 mm top/bottom, 100% infill, no supports needed) - 81 grams predicted
• One tooth - PLA+ (3.2 mm walls, 1.4 mm top/bottom, 100% infill, supports needed) - 8 grams predicted

• One power switch retainer - PL+ (3.2 mm walls, 1.4 mm top/bottom, 100% infill, no supports needed) - 1 gram predicted

• One TPU armor - TPU (Print at 99% scale to make the TPU a tight fit 1.6 mm walls, 1.4 mm top/bottom, 20% infill, supports needed) - 42 grams predicted

• One safety - PLA+ (3.2 mm walls, 1.4 mm top/bottom, 20% infill, supports needed)