Biosculptor

A biosculptor is a limited form of bio-assembler, made for the purposes of plastic surgery. It's alterations are not as extensive or as customizable as those available with a trained technician and a full surgical suite (for instance, genetic alteration only of the grossest sort can be performed), but it has the advantage of being portable and easy to use. 

The biosculptor can reduce mass (up to 40%), but not add it appreciably (5%). It cannot create new subcellular assemblies (like chloroplasts in a nonphotosynthetic organism), lay down neural pathways involved in complicated behaviors, or alter body plan extensively (e.g. four-limbed to six-limbed). In general, it's changes will not alter attributes (GM discretion).

The biosculptor folds up to about the size of a briefcase, and self-extends as soon as it's booted up. The operator simply chooses the desired template from the devices library (or downloads another template) and uses the key pad or voice command to add further specifications.

Once that's done, the patient enters the biosculptor and applies the appropriate sensors. The unit anesthetizes the patient and fills compartment with a gel-like nanotech solution. The nanites begin the task of disassembling then reassembling the patient's body into the desired form.

[Inspired by the device appearing in the images above from the comic Lost Horizons by Juan Zanotto.]