If you've got one of those Malm dressers from ikea -- http://www.ikea.com/us/en/catalog/categories/series/07468/ -- then you can turn it rather easily into a pretty sweet marble run. Marbles will roll across the top of the drawer, then down this half-ellipse-shaped ramp, and then across the next row of drawers in the other direction. To make this ramp, cut it out of a thin, flexible material, and assemble the pieces. In my dreams, this ramp should be made out of 1/32" birch aircraft plywood with a laser cutter. In real life, a laser printer, a cereal box and an x-acto knife work fine. Photos forthcoming, as soon as I've made a set of these to replace the current manually constructed prototypes. I haven't finalized all the dimensions yet, and some bits (epsecially the cutouts for the drawer slides) might be in the wrong places for your dresser. Edit: Design, test, iterate! Made a couple of small tweaks. Some photos of the previous version, sorry for the low res.Print out the PDF file on a piece of A3 paper (if you're in North America, use 11x17 paper). Cut the pieces out roughly; glue them onto a piece of cardboard, and cut them out with a box cutter. Make sure the little square is 1cm x 1cm. Everything should friction fit together, if you got the right thickness of cardboard; you may want to use a slightly thinner cardboard for the curved bit. I used a cheerios box for the curved part, and a heavy-cardstock stationery box for the backplate and frontplate. If you have access to a laser cutter, then use that instead, obviously. I think these would be pretty sweet if you lasercut them out of thin birch aircraft plywood. They'd even match the dresser. Also, please note that I want to be you. You might be able to make this work with a plot cutter too, but you might need to change the way the little slots are cut. Let me know if you want to do this. You might want to run a bead of glue along the two seams. Sometimes it is helpful to tape the ramp to the furniture (it falls out less often when the drawers are opened). When properly installed, you should still be able to use the dresser normally. This is a VERY parametric model - you can tweak everything, even down to accounting for the dimensions of the material and the width of the cut. The shape of the ramp can be given by arbitrary parametric equations; et cetera. It is done using Asymptote, a powerful C-like language (implemented in open-source software) used for making mathematical illustrations. It is modeled in 3D and then "unfolded" algorithmically to produce the correct 2D shape. There's probably a much easier way to do this, but I learned a lot by writing this code, so I really don't mind. I currently have a kind of kludgey process for getting the asymptote output into a correctly scaled PDF. I run the following commands on my linux box: asy -V ramp.asy ps2ps ramp.eps -o ramp_cleaned.eps and then import ramp_cleaned.eps into inkscape (which seems to get confused about asymptote's output unless the prior step is performed). I rescale things so that the little square is 1cm x 1cm, set the paper size to a3, and export as a PDF or SVG. TO DO: