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Top view of the XY plate with the heat spreader bar mounted. The M6 bolt should not project past the hex nut; otherwise, it may interfere with the face of the extruder stepper motor. Also, try to get the hex nut parallel with the long edge of the heat spreader bar. This also helps prevent any interference with the face of the stepper motor.
14 wires total:
4 x stepper motor
2 x thermocouple
2 x heater core
2 x heatsink fan
2 x endstop switch (Common & NO contacts)
2 x print cooling fan
Short XY Plate cut from 3mm thick aluminum plate. Short XY plate is based upon the DXF cut file,
xstageshort.dxf
found as a download of Thingiverse Thing 252041,
www.thingiverse.com/thing:252041
Use the short XY plate if you have a short NEMA17 stepper motor such as those MBI uses for their extruders. If you have a stepper motor with a bigger stack, then you may need to use xstagequ_bd.dxf.
The aluminum heat spreader bars are the proper 0.5 inch thick ones MBI uses on the Replicator 1 and 2 series. They provide far more contact area with the thermal barrier tube than the Mk7 style heat spreader bar. Unfortunately, a number of the Mk-style extruder kits provide the Mk7's thinner heat spreader bar (e.g., QU-BD's MBE v9). If you plan on extruding PLA, you want the thicker bar! Otherwise, you will likely experience jams on long duration prints.
Robotdigg.com and dealextreme sell the thicker bars BUT only one of the holes is tapped for M6 threads. Use that hole for the thermal barrier tube. The other hole is smooth bored and will accept a M6 bolt. Cut a M6 bolt to a length of 19 mm. (I do it by threading 4 M6 hex nuts on, cutting flush to the fourth nut, filing the cut end, then removing the nuts. (Having the nuts on helps you clean the cut threads after cutting.)
A hand cut slot has been made in the XY plate with which to affix the heat spreader bar using the cut M6 bolt and a thin M6 hex nut.
RepRap Mk2b dual voltage heater circuit board wired for +24V operation with a 10k ohm resistor and a red LED.
14 wires total:
4 x stepper motor
2 x thermocouple
2 x heater core
2 x heatsink fan
2 x endstop switch (Common & NO contacts)
2 x print cooling fan
21 ‪#‎3DBenchy‬ boats on a single 32-hour ‪#‎3dprint‬.
Read more at: 3dbenchy.com/?p=677
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Fused power inlet, front view. This particular inlet is a Corcom PE0SSSSX0 (Digikey CCM1384-ND) which is rated 10A @ 120VAC, fused, and filtered. It's overkill for this application but I happen to have a few of them and it's convenient to use the same unit everywhere.
Two safety grounds: one to mount to a filed down section of the frame (for good electrical contact), the other to run to the power supply. All four AC wires present as the switch is designed to interface to a 115/240 VAX PSU with the voltage selector on the PSU. The outside wires on the connector are the 115 hot and neutral.
WanHao LCD (connector at a better angle)
FlashForge button & SD card module (better job of assembling the pard with the buttons perpendicular to the board)
Ribbon connector is also from WanHao.
Carl Raffle heater blocks and thermal barrier tubes, available from
shop.raffle.ch
You really, really want thermal barrier tubes with the stepped down inside diameter. As far as I can tell, only Makerbot and Carl Raffle are correctly making these. The ones from other suppliers, including those from QU-BD are not correctly manufactured. (Avoid purchasing from QU-BD if you can help it. All too often they ship the wrong parts and will then never, ever answer calls or e-mail attempting to fix the problem.)
The 0.4 mm nozzles are from Performance 3-d,
The two thin M6 hex nuts (which Carl provides) are used as jam nuts to fix the thermal barrier tube to the heat spreader bar: one below the bar and one above. If you have some heatsink grease, use a small amount of it on the nuts. Apply a very thin layer of it to the nut faces which face the heat spreader bar as well as to their threads. That will further help transfer heat from the thermal barrier tube to the heat spreader bar.
This is just one style of mounting the Y axis endstop. If you instead use
www.thingiverse.com/thing:357587
you may find yourself doing something different. Or if your mount can clear the Y rod mounts, then you may be able to engage the upper portion of the X axis rod holders which ride on the Y rods.
21 ‪#‎3DBenchy‬ boats on a single 32-hour ‪#‎3dprint‬.
Read more at: 3dbenchy.com/?p=677
‪‬