The ornamental design for a snap off compule for a dental material, as shown and described.
FIG. 1 is an isometric view of a snap off compule for dental material;
FIG. 2 is a front side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a bottom view thereof; and,
FIG. 6 is a cross sectional side view of the snap off compule with the cap in place, taken along line 6-6 of FIG. 2.
The broken line shown in the drawing disclosure is included for the purpose of illustrating portions of the snap off compule for dental material and forms no part of the claimed design.