The BotBQ extruder assembly is pretty easy and straight forward. The first thing you need to do is make sure you have everything in front of you from the BOM (Bill of Materials) and just an advance reminder that you have washed your hands (and dried them of course) BEFORE attempting to 3D print your first BotBQ Burger! 3D Printed Food is still susceptible to germs and a clean working AND eating environment is optimal for your health and success.
Step one: Finishing your printed items
8mm Pulley –
Clean all support material and any unwanted or excess plastic away from your prints. It is especially important to make sure that the tunnels that the string will be threaded through is as clean and smooth as possible. Get your ‘super tiny screwdriver set’ that you got at the 1€ store (well, that’s where I got mine at least… lasted 4 years so far!) and take out a small flat-head and run it through the tunnels for the string that go through the 8mm pulley first, you can even run a small enough drill bit through there if you wish, but BE CAREFUL if you do that, I have torn prints to pieces in my early days in this 3d printing game! While cleaning the holes in the 8mm pulley, in the middle of the 8mm hole there runs a crevasse along half of the radius to allow a place for the string to hide form the 8mm bolt of the extruder and it helps to secure the string as well, smooth that part out as well.
BotBQ Extruder Block –
Make sure the holes for the M4 screws that will attach the BotBQ extruder to the wades block are clear, and use that same XS flat-head screwdriver to clean out the holes and tunnels in the extruder block. These holes and tunnels need to be extra clean and as smooth as you can get them so that the string doesn’t snag on anything while being pulled through them. Cleaning this part may take some time as you will want to be as thorough as you can, because you do NOT want anything to interrupt you on your way to 3D printed burger happiness!
Nozzle pulley –
This part is super simple to clean, just take a razor and that ‘super small flat-head screwdriver I’ve been talking about and clean that thing out like you’re trying to get the last drop of Tabasco out of the bottle.
That should be it for cleaning so far… make sure that your bearings are clean also, and that none of your screws or nuts have any rust on them. Don’t clean them so much that there is no oil left in the bearings or anything, just a light wipe down if they have no rust is fine.
Step Two: BotBQ Extruder Assembly
Take your length of string and we need to thread it through the BotBQ extruder block and secure it to the 8mm pulley.
The best way I’ve found to get the 2mm thick string through the block that holds the nozzle is to start at the side entrance and push it through the tunnel with a very small ~1-1.5mm wide screwdriver (see video)
Tie the end of the string coming up through the TOP of the extruder block to the middle of a 25mm screw and put a lock nut on it.
Thread the end of the thread coming out the SIDE of the extruder block through both sides of the 8mm pulley and tie a knot in that.
Take one 624z bearing and put a washer on each side and slide them together into the side entrance with some small needle nose pliers. Grab a 25mm screw, slide a washer on, push it through the hole on top and once you have it through the bearing add a washer and a lock nut. Repeat this for the top side bearing, and also for the Nozzle pulley, only add washers on the bearings and not on the OUTSIDE of the nozzle pulley… I have to edit the design to fit the washers still.
Hamburger Housing and Nozzle –
Attache the nozzle to the hamburger housing and push it UP through the correct grooves in the extruder block with enough space to still screw on the “push rod.” Put a piece of the clear mounting squares to the middle of the top of the push rod and make sure it is aligned with the center of the rod. Stick the nozzle pulley on there and make sure it is centered with the bearings aligned perpendicular (criss-cross) to the nozzle top and they line up correctly with the other bearing at the top of the extruder block. Slide the end of the string with the 25mm screw tied on through on top of the bearings and then slide the string through the other end of the extruder block where there is a slit for it, and the screw will have a groove on there to catch it when the extruder assembly is loaded.
Step Three: Attaching the BotBQ Extruder to your 3D Printer
Attaching the BotBQ Extruder is pretty straightforward. You just need to remove the idler block from the Wade’s block, slide on the 8mm pulley and you should be good to go! Check out the video above for a detailed approach.
Congrats: You did it!
You have now completed the BotBQ extruder assembly and you are even closer to printing out that hello kitty shaped burger, Good job! There is still a few more things to do before you get to that point, but take a moment to breath and stay calm while we knock out the other steps together… I’ll be right here to help, and you can also reference the videos if you need a boost as well.