Category: MakerBlock

All things MakerBlock: RepRap, MakerBot, Cupcake CNC, open source, and plastic building toys!

Winning for losing

The poor guys over at MakerBot just can’t win for losing.

People just begged for pre-orders.  Now people are upset they have to wait because of pre-orders!  Without pre-orders everyone would be guaranteed a longer wait time.

  • When you place a pre-order you get a place in line.  Otherwise you just have to be the fastest clicker when they post the new kits.
  • When you place a pre-order they can use those funds to get your parts, get parts for the next batch (while they work on yours), or, heaven forbid, eat.
  • When they get to use your funds to get parts for the next batch, that means they used the funds from the prior batch to get your parts.  This means your wait time was shorter because of pre-orders!

If you pre-order a MakerBot it may feel like you’re waiting a long time for your kit – but waiting on a pre-order is so much better than waiting for a sold out product to be placed back in stock.  In the meantime, there are so many ways to get ready, participate, and contribute.

Seriously, get started right now!  There’s not a moment to lose!

Blender help?

Ball joint thing
Ball joint thing

I’ve designed a new part for printing on Bender1 .  Here’s a picture of the part.  I’m trying to see if I can print a working ball joint.  Obviously, it needs to consist of  breakaway multi-parts.

If this works I’d like to try using it as a component of a larger more complicated object.  However, Skeinforge throws a fit every time I try to skein it.  I’m uploading it here in case anyone can help me fix it.

Printable ball joint v5

  1. If you’re just tuning in, that’s the name of my MakerBot [↩]

What’s so great about a RepRap anyhow?

When I read the RepRap blog or the RepRap builder’s blog I see people printing incredible things in PLA.  And I never hear about their troubles with PLA.  Nothing about it jamming or being fussy about temperatures.  What am I missing?  What are Darwins and Mendels doing that my little MakerBot isn’t?

RepRap interim challenge obstacles

The RepRap challenge has a number of obstacles for the interim award.  There are two in particular that seem insurmountable.

  1. Maintain a total materials and parts cost under $200 and that 90% of the volume of the printer parts be printed.
  2. The ability to print autonomously without a PC attached.

I have to imagine something large enough to accomplish all of the other goals would cost well over $200.00.  If an entire Darwin or Mendel were trasmorgrified King Midas1 style into pure plastic, I would think the plastic alone would eat up 90% of the budget.  Even the best deals around the internet for RepRap parts just the electronics are roughly $215.

I say it seems insurmountable – but if someone had told me two years ago I could one day buy a full kit for building a robot that would make me any plastic thing I could imagine for $1,000.00  I would have laughed at them.

  1. or Calvin and Hobbes [↩]

Wait a second… that’s not a trap at all!

I just realized that the second variation of my funnel/one-way-door mousetrap doesn’t really trap mice at all!

Since it is specifically designed to provide an avenue of escape to the mouse, there’s no trapping being done, and I may have just miserably failed the design challenge.  The challenge specifically states that the winning design is the one that first catches his mouse.

Plus, this particular design would require you to drill a 4cm hole and 4x 3mm holes in a door.  I’m guessing this is one of those “cure is worse than the disease” solutions.

How to test a ridiculous idea

Cathal Garvey posted his recommendations as to how those without mice can test their designs.  He suggests:

*Think* like the mouse, *be* the mouse!
Alternatively, leave one outside in the country or garden, and await your furry, diseased reward!

But how do you test a one way door/mouse funnel mousetrap if you don’t want to invite mice into your house?  I suppose a box with two such funnels installed with a bit of peanut butter inside.  If you wake up and find no mice or peanut butter – it either worked perfectly1 or it failed miserably2 !  If the mouse is stuck inside…  well I guess it kinda succeeded.

  1. as in the mouse left via the second one-way-exit [↩]
  2. as in the mouse left the wrong way out the first one-way-exit, just to be a rodent jerk [↩]

Must… stop… brain…

I can’t help it.  Another idea using the last mouse funnel occurred to me.

What if you had a long tube with a series of bristles all pointing in the same direction just like the mouse funnel?  Put some peanut butter on the outside, install in a door, and walk away happy and content that you’re saving mouse lives.

Once the mouse started down that tube it wouldn’t be able to turn around or back up easily.  Given the option of unlimited freedom outdoors and chewing its way back through pokey bits, I can’t imagine it would choose plastic splinters.

Self-emptying mouse funnel mousetrap

I’ve spent WAAAAY too much time thinking about this problem.  Here’s my new idea:

The hope is that a mouse inside your house will walk out the hole in the door to get to the peanut butter on the other side of the funnel.  Once inside the box with all of the peanut butter consumed the mouse can either (a) try to struggle past the pointy bits back into the house or (b) slip outside through the second funnel.

Mouse funnel mousetrap

Peanut Butter Jar Mousetrap v2.0
Mouse funnel mousetrap

After thinking a bit more about my design for a Peanut Butter Jar Mousetrap, I decided it could be even more minimal/adaptable.

This new mouse funnel mousetrap design requires four bolts, four nuts, and some kind of container with a 4cm hole in it.

Peanut butter is still a really good idea.

Test