Figure 4.

Lab-In-Syringe system from a syringe pump (SP) with 3 port head valve (HV) with an upside-down orientated syringe (S). 3D printed elements are shown in blue color and disassembled, required screws are not shown. A removable adaptor for the head valve (1) allows the positioning of the motor (M) close to the syringe. A holder for NdFeB magnets (2) is glued on-top that induce stirring bar rotation inside the syringe at the motor start. A LED holder (3) is screwed onto a fiber-optic adaptor (4) that is placed onto the glass barrel for in-syringe photometric measurements (Photometer and optical fibers not shown). Elements 5 and 6 compose a tray and universal support for deposition of tools (fittings, screwdriver, etc.) and to attach further items, e.g., the relay board for motor control. The photo shows the 3D printed elements 3 and 4 for in-syringe spectrophotometry.